Image Resizer

Resize images to the exact size you need

Every platform wants a different image size: a website banner, a YouTube thumbnail, a passport photo for an online form, a product photo for your shop. This image resizer changes the pixel dimensions of your photos quickly and privately, without uploading them.

What you can do:

• Resize by pixels: type a width or height. With Keep aspect ratio on, the other side is calculated for you.
• Resize by percentage: scale images from 5% to 200%.
• Batch resize many images with the same settings.
• Save as the same format, JPG, PNG or WebP.
• Download each image or all of them as a ZIP.

How to resize an image

1. Choose or drop one or more images. The size of the first image is shown.
2. Choose By pixels or By percentage.
3. Enter the new width or height, or move the percentage slider.
4. Pick the output format.
5. Click Resize images, check the previews and download.

Common image sizes

Platforms change their recommendations from time to time, so check their help pages for the latest sizes.

Resizing vs compressing vs cropping

• Resizing changes the number of pixels, which also makes the file smaller when you go down in size.
• Compressing keeps the same pixels but stores them more efficiently. Use the Image Compressor after resizing for the smallest files.
• Cropping cuts away parts of the image to change its shape. Use the Image Cropper for a 1:1 or 16:9 shape.

Making an image bigger than its original size cannot add real detail, so enlarged photos look softer. For the sharpest results, start from the largest version you have.

Resizing is done with the browser's high-quality canvas smoothing. Learn about image formats on MDN, or change formats with the Image Converter. See all PDF and image tools.

A simple image workflow

For the best results, follow this order: crop to the right shape with the Image Cropper, resize to the exact pixels here, convert to WebP with the Image Converter and finally compress with the Image Compressor. Doing it in this order keeps quality high and files small.

Popular image sizes

Platforms change their recommendations from time to time, so check the platform's help pages for the latest numbers.

Keep the aspect ratio

The aspect ratio is the shape of the image, width compared to height. If you change only the width and keep the ratio locked, the height adjusts automatically and the image does not look stretched. If you need a different shape, for example a square from a wide photo, crop first with the Image Cropper and then resize.

Making images smaller vs. larger

Making an image smaller (downscaling) keeps it sharp and reduces file size a lot. Making an image larger (upscaling) cannot add real detail; the browser only stretches the pixels, so the result can look soft. Always start from the largest original you have.

Resizing for official forms

Government and university portals often ask for photos and signatures with exact pixel dimensions and a maximum file size, for example 200 x 230 pixels under 50 KB. Here is how:

1. Crop the photo to the right shape with the Image Cropper.
2. Resize it here to the exact width and height.
3. Save as JPG.
4. If the file is still too big, run it through the Image Compressor at a lower quality.

Resizing for faster websites

Uploading a 4000-pixel phone photo into a 800-pixel space forces visitors to download five times more pixels than they see. Resize images to about the largest size they are displayed, or twice that for sharp screens. Check the effect on your page with the Page Size Checker. Google's image optimisation guide on web.dev explains responsive image sizes in depth.

Everything happens in your browser, so personal photos stay on your device.

Example: resizing many photos at once

An online shop owner has 40 product photos from a camera, each 6000 x 4000 pixels. The website theme displays products at up to 1000 pixels wide.

1. Add all 40 photos to the resizer.
2. Set the width to 2000 px (twice the display size, so they stay sharp on high-resolution phones) and keep the aspect ratio locked.
3. Choose WebP or JPG as the format.
4. Download the ZIP and upload the new files.

The images now load several times faster, while still looking crisp. For square product thumbnails, crop to 1:1 with the Image Cropper before resizing so every product appears in the same shape on category pages.

Quick checklist for resized images

• Keep the aspect ratio locked unless you really want to change the shape.
• Resize down from the largest original you have; avoid enlarging small images.
• Use about twice the display size for sharp results on modern phone screens.
• Save photos as JPG or WebP and graphics with transparency as PNG or WebP.
• Compress the result if you need a smaller file, then add descriptive file names and alt text.

Last updated: October 25, 2026